Lock



FIG. 1 is a perspective view from the front, top and left side of a lock showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plane view thereof; and,

FIG. 7 is a bottom plane view thereof. 

The ornamental design for a lock, as shown. 